Serial Interface - Siemens SIMATIC IPC277G Operating Instructions Manual

Technical specifications
8.5 Hardware descriptions
8.5.2.6

Serial interface

Pin assignment RS232
Pin
1
2
3
4
5
6
7
8
9
Pin assignment RS422
Pin
1
2
3
4
5
6
7
8
9
Pin assignment RS485
Pin
1
2
3
4
5
6
7
8
9
94
Short description
DCD
RxD
TxD
DTR
M
DSR
RTS
CTS
RI
Short description
TX-
TX+
RX+
RX-
M
nc
nc
nc
nc
Short description
Data-
Data+
nc
nc
M
nc
nc
nc
nc
RS232
RS422
RS485
Meaning
Data carrier detect (I)
Received data (I)
Transmitted data (O)
Data terminal ready (O)
Ground
Data set ready (I)
Request to send (O)
Clear to send (I)
Incoming call (I)
Meaning
Transmit data - (O) for full-duplex mode
Transmit data + (O) for full-duplex mode
Receive data + (I) for full-duplex mode
Receive data - (I) for full-duplex mode
Signal ground
Meaning
Transmit / receive data - (I/O) for half-duplex mode
Transmit / receive data+ (I/O) for half-duplex mode
Signal ground
Operating Instructions, 08/2021, A5E50059956-AA
SIMATIC IPC277G